Li Peng, Chang Zhiyong
Department of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, China.
Institute for Aero-Engine Smart Assembly of Shaanxi Province, Xi'an 710072, China.
Micromachines (Basel). 2021 Oct 1;12(10):1207. doi: 10.3390/mi12101207.
The normal rake angle is an important geometric parameter of a turning tool, and it directly affects the accuracy of the cutting force prediction. In this study, an accurate model of the working normal rake angle (WNRA) and working inclination angle (WIA) is presented, including variation in the cutting velocity direction. The active cutting edge of the turning tool is discretized into differential elements. Based on the geometric size of the workpiece and the position of the differential elements, the cutting velocity direction of each differential element is calculated, and analytical expressions for the WNRA, WIA, and working side cutting edge angle are obtained for each differential element. The size of the workpiece is found to exert an effect on the WNRA and WIA of the turning tool. The WNRA and WIA are used to predict the cutting force. A good agreement between the predicted and experimental results from a series of turning experiments on GH4169 with different cutting parameters (cutting depth and feed rate) demonstrates that the proposed model is accurate and effective. This research provides theoretical guidelines for high-performance machining.
法向前角是车刀的一个重要几何参数，它直接影响切削力预测的准确性。在本研究中，提出了一个精确的工作法向前角（WNRA）和工作倾斜角（WIA）模型，包括切削速度方向的变化。将车刀的主切削刃离散为微分单元。根据工件的几何尺寸和微分单元的位置，计算每个微分单元的切削速度方向，并得到每个微分单元的WNRA、WIA和工作侧刃倾角的解析表达式。发现工件尺寸对车刀的WNRA和WIA有影响。WNRA和WIA用于预测切削力。在不同切削参数（切削深度和进给率）下对GH4169进行的一系列车削实验中，预测结果与实验结果吻合良好，表明所提出的模型准确有效。本研究为高性能加工提供了理论指导。
